[ALSA] oxygen: add PM support

Add suspend/resume support.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

diff --cc sound/pci/oxygen/hifier.c
Simple merge

diff --cc sound/pci/oxygen/oxygen.c
Simple merge

diff --cc sound/pci/oxygen/oxygen.h
Simple merge

diff --cc sound/pci/oxygen/oxygen_lib.c
Simple merge

diff --cc sound/pci/oxygen/oxygen_pcm.c
Simple merge

diff --cc sound/pci/oxygen/virtuoso.c
Simple merge